Yes, it's there on the Chinese site:

http://car.ctrip.com/hwdaijia/shopping/safe

Not at Chengdu specifically, but I've found negotiating long-distance runs late at night at Chinese airports to be a pretty bad experience. Somehow you end up talking to just one driver that's interested in taking you, and it's his price or walk. The other drivers just aren't interested once you're negotiating with another driver.